• Structural Monitoring and Maintenance
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• 제5권3호
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• pp.363-377
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• 2018

The proper functioning of critical points on transport infrastructure is decisive for the entire network. Tunnels and bridges certainly belong to the critical points of the surface transport network, both road and rail. Risk management should be a holistic and dynamic process throughout the entire life cycle. However, the level of risk is usually determined only during the design stage mainly due to the fact that it is a time-consuming and costly process. This paper presents a simplified quantitative risk analysis method that can be used any time during the decades of a tunnel's lifetime and can estimate the changing risks on a continuous basis and thus uncover hidden safety threats. The presented method is a decision support system for tunnel managers designed to preserve or even increase tunnel safety. The CAPITA method is a deterministic scenario-oriented risk analysis approach for assessment of mortality risks in road tunnels in case of the most dangerous situation - a fire. It is implemented through an advanced risk analysis CAPITA SW. Both, the method as well as the resulting software were developed by the authors' team. Unlike existing analyzes requiring specialized microsimulation tools for traffic flow, smoke propagation and evacuation modeling, the CAPITA contains comprehensive database with the results of thousands of simulations performed in advance for various combinations of variables. This approach significantly simplifies the overall complexity and thus enhances the usability of the resulting risk analysis. Additionally, it provides the decision makers with holistic view by providing not only on the expected risk but also on the risk's sensitivity to different variables. This allows the tunnel manager or another decision maker to estimate the primary change of risk whenever traffic conditions in the tunnel change and to see the dependencies to particular input variables.

• International journal of advanced smart convergence
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• 제7권4호
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• pp.197-205
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• 2018

Nowadays, wireless sensor networks (WSNs) have been widely adopted in structural health monitoring (SHM) systems for social overhead capital (SOC) public infrastructures. Structural health information, environmental disturbances and sudden changes of weather conditions, damage detections, and external load quantizing are among the capabilities required of SHM systems. These information requires an efficient transmission with which an efficient mobility management support for wireless networks can provide. This paper deals with the analysis of mobility management schemes in order to address the real-time requirement of data traffic delivery for critical SHM information. The host-based and network-based mobility management protocols have been identified and the advantages of network mobility (NEMO) enabled Proxy Mobile Internet Protocol version 6 (PMIPv6) have been leveraged in order to address the SHM information transmission needs. The scheme allows an efficient information transmission as it improves the handover performance due to shortened handover latency as well as reduced signaling overhead.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권12호
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• pp.5286-5306
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• 2016

Emerging applications in automation, medical imaging, traffic monitoring and surveillance need real-time data transmission over Wireless Sensor Networks (WSNs). Guaranteeing Quality of Service (QoS) for real-time traffic over WSNs creates new challenges. Rapid penetration of smart devices, standardization of Machine Type Communications (MTC) in next generation 5G wireless networks have added new dimensions in these challenges. In order to satisfy such precise QoS constraints, in this paper, we propose a new cross-layer QoS-provisioning strategy in Wireless Multimedia Sensor Networks (WMSNs). The network layer performs statistical estimation of sensory QoS parameters. Identifying QoS-routing problem with multiple objectives as NP-complete, it discovers near-optimal QoS-routes by using evolutionary genetic algorithms. Subsequently, the Medium Access Control (MAC) layer classifies the packets, automatically adapts the contention window, based on QoS requirements and transmits the data by using routing information obtained by the network layer. Performance analysis is carried out to get an estimate of the overall system. Through the simulation results, it is manifested that the proposed strategy is able to achieve better throughput and significant lower delay, at the expense of negligible energy consumption, in comparison to existing WMSN QoS protocols.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제16권1호
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• pp.90-94
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• 2010

본 논문에서는 지능형 교통정보 시스템에서 활용할 수 있는 차량의 연관 추적 방법에 관하여 제안한다. 차량의 연관 추적과정에서 발생하는 차량 간 겹침 문제를 해결하기 위하여 위치 평균값과 시공간 연관 정보를 이용한 연관 추적 방법을 제안하였고 배경영상의 신뢰도를 향상시키기 위하여 배경영상 갱신 방법을 제안하였다. 제안한 방법의 성능 평가를 위하여 다양한 위치의 교통 정보 수집 CCTV에서 촬영된 영상을 사용하였고 평균 96% 이상의 추적 성공률을 보였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권5호
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• pp.1708-1734
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• 2022

In the development of logistics system, the breakthrough of important technologies such as technology platform for logistics information management and control is the key content of the study. Based on Javascript and JQuery, the logistics system realizes real-time monitoring, collection of historical status data, statistical analysis and display, intelligent recommendation and other functions. In order to strengthen the cooperation of warehouse storage, enhance the utilization rate of resources, and achieve the purpose of real-time and visual supervision of transportation equipment and cargo tracking, this paper studies the VNF dynamic deployment and SFC routing problem in the network load change scenario based on the logistics system. The BIP model is used to model the VNF dynamic deployment and routing problem. The optimization objective is to minimize the total cost overhead generated by each SFCR. Furthermore, the application of the SFC mapping algorithm in the routing topology solving problem is proposed. Based on the concept of relative cost and the idea of topology transformation, the SFC-map algorithm can efficiently complete the dynamic deployment of VNF and the routing calculation of SFC by using multi-layer graph. In the simulation platform based on the logistics system, the proposed algorithm is compared with VNF-DRA algorithm and Provision Traffic algorithm in the network receiving rate, throughput, path end-to-end delay, deployment number, running time and utilization rate. According to the test results, it is verified that the test results of the optimization algorithm in this paper are obviously improved compared with the comparison method, and it has higher practical application and promotion value.

• 대한교통학회지
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• 제35권2호
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• pp.116-128
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• 2017

교통사고는 운전자가 주변 차량 및 도로기하구조 상태 변화에 대한 인지부족과 적절한 회피 행동을 능동적으로 수행하지 못하는 경우에 순간적으로 발생하는 차량의 물리적 충돌사건으로 정의 될 수 있다. 따라서, 운전자가 도로를 주행하면서 만들어 내는 주변 환경과의 상호작용을 지속적으로 모니터링하고, 교통사고를 유발할 개연성이 높은 이벤트를 검지하는 것은 교통사고 예방을 위한 선결조건이다. 본 연구에서는 연속류 도로를 대상으로, GPS(Global Positioning System)-IMU(Inertial Measurement Unit), 카메라, 레이더, 라이다가 부착된 조사 차량을 이용하여 도로기하구조 및 교통환경 정보를 취득하였다. 취득된 정보를 가공하여 차량의 상호 작용 및 도로기하구조 특성을 고려한 주변차량과의 충돌 가능성여부를 평가할 수 있는 알고리즘을 개발하였다. 특히, 도로기하구조를 제한속도(직선부), 안전 속도(곡선부)로 구분하여 평가하고, 교통안전지표인 SDI를 이용하여 차량의 주행안전성을 평가하였다. 본 연구에서 개발한 방법론은 도래하는 자율주행시대에 차량의 센서로 부터 수집이 가능한 자료를 이용하여 안전성을 평가한다는 관점에서 향후 유용하게 활용 될 수 있을 것으로 기대된다.

• 대한공간정보학회지
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• 제18권3호
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• pp.91-96
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• 2010

도시는 유기체와 같이 외형적 확산과 내부공간구조가 끊임없이 변화하며, 교통 정보 통신기술의 발달에 따라 변화의 속도와 형태를 달리해 왔다. 특히 교통의 발달은 도시 외형적 성장에 있어서 가장 중요한 원인이 되었으며 이러한 교통체계는 토지이용의 변화에서 비롯되었고 소음 등 각종 환경문제를 야기하였다. 본 논문은 국가소음정보시스템에서 제공되는 소음측정망 자료를 이용하여 용도지역별 소음변화특성을 분석하였다. 그 결과 도시공간상의 용도지역별 소음분포를 파악할 수 있었으며 이를 이용하여 용도지역별 소음지도를 제작할 수 있는 기반을 조성 할 수 있었다.

• 환경영향평가
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• 제7권2호
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• pp.83-88
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• 1998

Filter badge type sampler has not been widely used to evaluate air quality over large cities in Korea while it can be successfully used for multi-point sampling and analysis. We evaluated the passive sampler as a new tool to monitor air quality over large cities. We latticed Metropolitan Seoul into $2{\times}2Km$ to give 136 points. $NO_2$ concentrations were measured at all the points in the Spring and Summer of 1997. According to the passive sampler data, natural green zones generally recorded lower $NO_2$ concentrations than major streets and traffic congestion areas. Passive samplers with abundant 136 points gave more detailed picture of $NO_2$ distribution while auto-monitoring network did not clearly provide the characteristics of local land use. Also, passive samplers gave 15% higher values than auto-monitoring network. The correlation between the two values appears very high judging from the regression slope of 0.92 and correlation coefficient of 0.91. This study clearly demonstrates the effectiveness of the passive sampler as a tool to monitor air quality over large cities.

• 정보보호학회논문지
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• 제21권6호
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• pp.67-81
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• 2011

최근 세계 각지에 국가 주요 산업시설을 목표로 하는 스턱스넷(stuxnet)과 같은 '사이버 무기'가 나타나 보안전문가들이 주목하고 있다. 도시의 교통과 지하철, 상수도 등과 같은 기반시설을 제어하는 네트워크는 전통적으로 폐쇄망으로 운영되고 있어 바이러스, 악성코드 등의 위협에 안전한 것으로 인식되어 왔으나, 이제는 새로운 공격 위협에 능동적으로 대처해야 할 때이다. 본 연구에서는 도시 기반시설 SCADA망의 제어시스템 현황과 위험을 분석하고, 운영환경에 맞는 보안 모델을 수립함으로써 이러한 위협에 대응하기 위한 방향을 제시하고자 한다.

• 대한의생명과학회지
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• 제16권3호
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• pp.193-196
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• 2010

Multiplex PCR-based short tandem repeat (STR) analysis is considered as a good tool for monitoring bone marrow engraftment after sex-mismatched allogeneic transplantation and provides a sensitive and accurate assessment of the contribution of both donor and/or recipient cells in post-transplantation specimens. Forensic STR analysis and quantitative real time PCR are used to determine the proportion of donor versus recipient each contained within the total DNA. The STR markers were co-amplified in a single reaction by using commercial $PowerPlex^{(R)}$ 16 system and $AmpFISTR^{(R)}$ $Identifiler^{(R)}$ / $Yfiler^{(R)}$ PCR amplification kits. Separation of the PCR products and fluorescence detection were performed by ABI $PRIS^{(R)}$ 3100 Genetic Analyzer with capillary electrophoresis. The $GeneMapper^{TM}$ ID software were used for size calling and analysis of STR profiles. Extracted DNA was quantified by the $Quantifiler^{TM}$ Human DNA / Y Human Male DNA Quantification Kit The intent of this study was to analyze the ratio of donor versus recipient cells in the post-transplant peripheral blood, spleen, lung and kidney specimens. Specimens were taken from the traffic accident male victim who had been engrafted from bone marrow female donor. Blood and spleen specimens displayed female donor DNA profile. Kidney specimen showed male recipient DNA profile. Interestingly, lung tissue showed mixed profiles. The findings of this study indicate that the forensic STR analysis using fluorescence labeling PCR combined with capillary electrophoresis is quick and reliable enough to assess the ratio of donor versus recipient cells and to monitor the mixed chimeric patterns.